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Proximate causes of avian protandry differ between subspecies with contrasting migration challenges

by Heiko Schmaljohann, Christoph Meier, Debora Arlt, Franz Bairlein, Herman van Oosten, Yolanda E. Morbey, Susanne Åkesson, Martin Buchmann, Nikita Chernetsov, Robert Desaever, John Elliott, Magnus Hellström, Felix Liechti, Aïda López, John Middleton, Ulf Ottosson, Tomas Pärt, Fernando Spina, Cas Eikenaar